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So there's urushi lacquer, cashew lacquer and shellac... which is the best? Shellac?

I use Cashew, but it makes sense only if you have a lot fo stones to seal. One can is ~30 bucks for I think 50ml, the good news is it can be diluted a lot.
The easiest option would be Shellac, or some other water proof lacquer, readily available in stores.

I simply use shellac on most of my stones. For $10 at Lowes, it can't be beaten. However, my best stones are done the "traditional" way, in Urushi. But as Stefan mentioned, and I can attest to the fact, it "can" cause severe allergic reactions. Also, if you are in the US it is quite difficult and expensive to get Urushi, but if you ever get to visit China, Korea, or Japan, it is much easier to come by.

At Death's Door You Only Have 2 choices. Die Happy or Die Regretfully.
Knowing this...........Choose 1 and Live!!!!!!!!!